// Copyright (c) 2014 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <crypto/sha256.h>

#include <compat/cpuid.h>
#include <crypto/common.h>

#include <cassert>
#include <cstring>

#if defined(__x86_64__) || defined(__amd64__) || defined(__i386__)
#if defined(USE_ASM)
namespace sha256_sse4 {
void Transform(uint32_t *s, const uint8_t *chunk, size_t blocks);
}
#endif
#endif

namespace sha256d64_sse41 {
void Transform_4way(uint8_t *out, const uint8_t *in);
}

namespace sha256d64_avx2 {
void Transform_8way(uint8_t *out, const uint8_t *in);
}

namespace sha256d64_shani {
void Transform_2way(uint8_t *out, const uint8_t *in);
}

namespace sha256_shani {
void Transform(uint32_t *s, const uint8_t *chunk, size_t blocks);
}

// Internal implementation code.
namespace {
/// Internal SHA-256 implementation.
namespace sha256 {
    inline uint32_t Ch(uint32_t x, uint32_t y, uint32_t z) {
        return z ^ (x & (y ^ z));
    }
    inline uint32_t Maj(uint32_t x, uint32_t y, uint32_t z) {
        return (x & y) | (z & (x | y));
    }
    inline uint32_t Sigma0(uint32_t x) {
        return (x >> 2 | x << 30) ^ (x >> 13 | x << 19) ^ (x >> 22 | x << 10);
    }
    inline uint32_t Sigma1(uint32_t x) {
        return (x >> 6 | x << 26) ^ (x >> 11 | x << 21) ^ (x >> 25 | x << 7);
    }
    inline uint32_t sigma0(uint32_t x) {
        return (x >> 7 | x << 25) ^ (x >> 18 | x << 14) ^ (x >> 3);
    }
    inline uint32_t sigma1(uint32_t x) {
        return (x >> 17 | x << 15) ^ (x >> 19 | x << 13) ^ (x >> 10);
    }

    /** One round of SHA-256. */
    inline void Round(uint32_t a, uint32_t b, uint32_t c, uint32_t &d,
                      uint32_t e, uint32_t f, uint32_t g, uint32_t &h,
                      uint32_t k) {
        uint32_t t1 = h + Sigma1(e) + Ch(e, f, g) + k;
        uint32_t t2 = Sigma0(a) + Maj(a, b, c);
        d += t1;
        h = t1 + t2;
    }

    /** Initialize SHA-256 state. */
    inline void Initialize(uint32_t *s) {
        s[0] = 0x6a09e667ul;
        s[1] = 0xbb67ae85ul;
        s[2] = 0x3c6ef372ul;
        s[3] = 0xa54ff53aul;
        s[4] = 0x510e527ful;
        s[5] = 0x9b05688cul;
        s[6] = 0x1f83d9abul;
        s[7] = 0x5be0cd19ul;
    }

    /**
     * Perform a number of SHA-256 transformations, processing 64-byte chunks.
     */
    void Transform(uint32_t *s, const uint8_t *chunk, size_t blocks) {
        while (blocks--) {
            uint32_t a = s[0], b = s[1], c = s[2], d = s[3], e = s[4], f = s[5],
                     g = s[6], h = s[7];
            uint32_t w0, w1, w2, w3, w4, w5, w6, w7, w8, w9, w10, w11, w12, w13,
                w14, w15;

            Round(a, b, c, d, e, f, g, h,
                  0x428a2f98 + (w0 = ReadBE32(chunk + 0)));
            Round(h, a, b, c, d, e, f, g,
                  0x71374491 + (w1 = ReadBE32(chunk + 4)));
            Round(g, h, a, b, c, d, e, f,
                  0xb5c0fbcf + (w2 = ReadBE32(chunk + 8)));
            Round(f, g, h, a, b, c, d, e,
                  0xe9b5dba5 + (w3 = ReadBE32(chunk + 12)));
            Round(e, f, g, h, a, b, c, d,
                  0x3956c25b + (w4 = ReadBE32(chunk + 16)));
            Round(d, e, f, g, h, a, b, c,
                  0x59f111f1 + (w5 = ReadBE32(chunk + 20)));
            Round(c, d, e, f, g, h, a, b,
                  0x923f82a4 + (w6 = ReadBE32(chunk + 24)));
            Round(b, c, d, e, f, g, h, a,
                  0xab1c5ed5 + (w7 = ReadBE32(chunk + 28)));
            Round(a, b, c, d, e, f, g, h,
                  0xd807aa98 + (w8 = ReadBE32(chunk + 32)));
            Round(h, a, b, c, d, e, f, g,
                  0x12835b01 + (w9 = ReadBE32(chunk + 36)));
            Round(g, h, a, b, c, d, e, f,
                  0x243185be + (w10 = ReadBE32(chunk + 40)));
            Round(f, g, h, a, b, c, d, e,
                  0x550c7dc3 + (w11 = ReadBE32(chunk + 44)));
            Round(e, f, g, h, a, b, c, d,
                  0x72be5d74 + (w12 = ReadBE32(chunk + 48)));
            Round(d, e, f, g, h, a, b, c,
                  0x80deb1fe + (w13 = ReadBE32(chunk + 52)));
            Round(c, d, e, f, g, h, a, b,
                  0x9bdc06a7 + (w14 = ReadBE32(chunk + 56)));
            Round(b, c, d, e, f, g, h, a,
                  0xc19bf174 + (w15 = ReadBE32(chunk + 60)));

            Round(a, b, c, d, e, f, g, h,
                  0xe49b69c1 + (w0 += sigma1(w14) + w9 + sigma0(w1)));
            Round(h, a, b, c, d, e, f, g,
                  0xefbe4786 + (w1 += sigma1(w15) + w10 + sigma0(w2)));
            Round(g, h, a, b, c, d, e, f,
                  0x0fc19dc6 + (w2 += sigma1(w0) + w11 + sigma0(w3)));
            Round(f, g, h, a, b, c, d, e,
                  0x240ca1cc + (w3 += sigma1(w1) + w12 + sigma0(w4)));
            Round(e, f, g, h, a, b, c, d,
                  0x2de92c6f + (w4 += sigma1(w2) + w13 + sigma0(w5)));
            Round(d, e, f, g, h, a, b, c,
                  0x4a7484aa + (w5 += sigma1(w3) + w14 + sigma0(w6)));
            Round(c, d, e, f, g, h, a, b,
                  0x5cb0a9dc + (w6 += sigma1(w4) + w15 + sigma0(w7)));
            Round(b, c, d, e, f, g, h, a,
                  0x76f988da + (w7 += sigma1(w5) + w0 + sigma0(w8)));
            Round(a, b, c, d, e, f, g, h,
                  0x983e5152 + (w8 += sigma1(w6) + w1 + sigma0(w9)));
            Round(h, a, b, c, d, e, f, g,
                  0xa831c66d + (w9 += sigma1(w7) + w2 + sigma0(w10)));
            Round(g, h, a, b, c, d, e, f,
                  0xb00327c8 + (w10 += sigma1(w8) + w3 + sigma0(w11)));
            Round(f, g, h, a, b, c, d, e,
                  0xbf597fc7 + (w11 += sigma1(w9) + w4 + sigma0(w12)));
            Round(e, f, g, h, a, b, c, d,
                  0xc6e00bf3 + (w12 += sigma1(w10) + w5 + sigma0(w13)));
            Round(d, e, f, g, h, a, b, c,
                  0xd5a79147 + (w13 += sigma1(w11) + w6 + sigma0(w14)));
            Round(c, d, e, f, g, h, a, b,
                  0x06ca6351 + (w14 += sigma1(w12) + w7 + sigma0(w15)));
            Round(b, c, d, e, f, g, h, a,
                  0x14292967 + (w15 += sigma1(w13) + w8 + sigma0(w0)));

            Round(a, b, c, d, e, f, g, h,
                  0x27b70a85 + (w0 += sigma1(w14) + w9 + sigma0(w1)));
            Round(h, a, b, c, d, e, f, g,
                  0x2e1b2138 + (w1 += sigma1(w15) + w10 + sigma0(w2)));
            Round(g, h, a, b, c, d, e, f,
                  0x4d2c6dfc + (w2 += sigma1(w0) + w11 + sigma0(w3)));
            Round(f, g, h, a, b, c, d, e,
                  0x53380d13 + (w3 += sigma1(w1) + w12 + sigma0(w4)));
            Round(e, f, g, h, a, b, c, d,
                  0x650a7354 + (w4 += sigma1(w2) + w13 + sigma0(w5)));
            Round(d, e, f, g, h, a, b, c,
                  0x766a0abb + (w5 += sigma1(w3) + w14 + sigma0(w6)));
            Round(c, d, e, f, g, h, a, b,
                  0x81c2c92e + (w6 += sigma1(w4) + w15 + sigma0(w7)));
            Round(b, c, d, e, f, g, h, a,
                  0x92722c85 + (w7 += sigma1(w5) + w0 + sigma0(w8)));
            Round(a, b, c, d, e, f, g, h,
                  0xa2bfe8a1 + (w8 += sigma1(w6) + w1 + sigma0(w9)));
            Round(h, a, b, c, d, e, f, g,
                  0xa81a664b + (w9 += sigma1(w7) + w2 + sigma0(w10)));
            Round(g, h, a, b, c, d, e, f,
                  0xc24b8b70 + (w10 += sigma1(w8) + w3 + sigma0(w11)));
            Round(f, g, h, a, b, c, d, e,
                  0xc76c51a3 + (w11 += sigma1(w9) + w4 + sigma0(w12)));
            Round(e, f, g, h, a, b, c, d,
                  0xd192e819 + (w12 += sigma1(w10) + w5 + sigma0(w13)));
            Round(d, e, f, g, h, a, b, c,
                  0xd6990624 + (w13 += sigma1(w11) + w6 + sigma0(w14)));
            Round(c, d, e, f, g, h, a, b,
                  0xf40e3585 + (w14 += sigma1(w12) + w7 + sigma0(w15)));
            Round(b, c, d, e, f, g, h, a,
                  0x106aa070 + (w15 += sigma1(w13) + w8 + sigma0(w0)));

            Round(a, b, c, d, e, f, g, h,
                  0x19a4c116 + (w0 += sigma1(w14) + w9 + sigma0(w1)));
            Round(h, a, b, c, d, e, f, g,
                  0x1e376c08 + (w1 += sigma1(w15) + w10 + sigma0(w2)));
            Round(g, h, a, b, c, d, e, f,
                  0x2748774c + (w2 += sigma1(w0) + w11 + sigma0(w3)));
            Round(f, g, h, a, b, c, d, e,
                  0x34b0bcb5 + (w3 += sigma1(w1) + w12 + sigma0(w4)));
            Round(e, f, g, h, a, b, c, d,
                  0x391c0cb3 + (w4 += sigma1(w2) + w13 + sigma0(w5)));
            Round(d, e, f, g, h, a, b, c,
                  0x4ed8aa4a + (w5 += sigma1(w3) + w14 + sigma0(w6)));
            Round(c, d, e, f, g, h, a, b,
                  0x5b9cca4f + (w6 += sigma1(w4) + w15 + sigma0(w7)));
            Round(b, c, d, e, f, g, h, a,
                  0x682e6ff3 + (w7 += sigma1(w5) + w0 + sigma0(w8)));
            Round(a, b, c, d, e, f, g, h,
                  0x748f82ee + (w8 += sigma1(w6) + w1 + sigma0(w9)));
            Round(h, a, b, c, d, e, f, g,
                  0x78a5636f + (w9 += sigma1(w7) + w2 + sigma0(w10)));
            Round(g, h, a, b, c, d, e, f,
                  0x84c87814 + (w10 += sigma1(w8) + w3 + sigma0(w11)));
            Round(f, g, h, a, b, c, d, e,
                  0x8cc70208 + (w11 += sigma1(w9) + w4 + sigma0(w12)));
            Round(e, f, g, h, a, b, c, d,
                  0x90befffa + (w12 += sigma1(w10) + w5 + sigma0(w13)));
            Round(d, e, f, g, h, a, b, c,
                  0xa4506ceb + (w13 += sigma1(w11) + w6 + sigma0(w14)));
            Round(c, d, e, f, g, h, a, b,
                  0xbef9a3f7 + (w14 + sigma1(w12) + w7 + sigma0(w15)));
            Round(b, c, d, e, f, g, h, a,
                  0xc67178f2 + (w15 + sigma1(w13) + w8 + sigma0(w0)));

            s[0] += a;
            s[1] += b;
            s[2] += c;
            s[3] += d;
            s[4] += e;
            s[5] += f;
            s[6] += g;
            s[7] += h;
            chunk += 64;
        }
    }

    void TransformD64(uint8_t *out, const uint8_t *in) {
        // Transform 1
        uint32_t a = 0x6a09e667ul;
        uint32_t b = 0xbb67ae85ul;
        uint32_t c = 0x3c6ef372ul;
        uint32_t d = 0xa54ff53aul;
        uint32_t e = 0x510e527ful;
        uint32_t f = 0x9b05688cul;
        uint32_t g = 0x1f83d9abul;
        uint32_t h = 0x5be0cd19ul;

        uint32_t w0, w1, w2, w3, w4, w5, w6, w7, w8, w9, w10, w11, w12, w13,
            w14, w15;

        Round(a, b, c, d, e, f, g, h, 0x428a2f98ul + (w0 = ReadBE32(in + 0)));
        Round(h, a, b, c, d, e, f, g, 0x71374491ul + (w1 = ReadBE32(in + 4)));
        Round(g, h, a, b, c, d, e, f, 0xb5c0fbcful + (w2 = ReadBE32(in + 8)));
        Round(f, g, h, a, b, c, d, e, 0xe9b5dba5ul + (w3 = ReadBE32(in + 12)));
        Round(e, f, g, h, a, b, c, d, 0x3956c25bul + (w4 = ReadBE32(in + 16)));
        Round(d, e, f, g, h, a, b, c, 0x59f111f1ul + (w5 = ReadBE32(in + 20)));
        Round(c, d, e, f, g, h, a, b, 0x923f82a4ul + (w6 = ReadBE32(in + 24)));
        Round(b, c, d, e, f, g, h, a, 0xab1c5ed5ul + (w7 = ReadBE32(in + 28)));
        Round(a, b, c, d, e, f, g, h, 0xd807aa98ul + (w8 = ReadBE32(in + 32)));
        Round(h, a, b, c, d, e, f, g, 0x12835b01ul + (w9 = ReadBE32(in + 36)));
        Round(g, h, a, b, c, d, e, f, 0x243185beul + (w10 = ReadBE32(in + 40)));
        Round(f, g, h, a, b, c, d, e, 0x550c7dc3ul + (w11 = ReadBE32(in + 44)));
        Round(e, f, g, h, a, b, c, d, 0x72be5d74ul + (w12 = ReadBE32(in + 48)));
        Round(d, e, f, g, h, a, b, c, 0x80deb1feul + (w13 = ReadBE32(in + 52)));
        Round(c, d, e, f, g, h, a, b, 0x9bdc06a7ul + (w14 = ReadBE32(in + 56)));
        Round(b, c, d, e, f, g, h, a, 0xc19bf174ul + (w15 = ReadBE32(in + 60)));
        Round(a, b, c, d, e, f, g, h,
              0xe49b69c1ul + (w0 += sigma1(w14) + w9 + sigma0(w1)));
        Round(h, a, b, c, d, e, f, g,
              0xefbe4786ul + (w1 += sigma1(w15) + w10 + sigma0(w2)));
        Round(g, h, a, b, c, d, e, f,
              0x0fc19dc6ul + (w2 += sigma1(w0) + w11 + sigma0(w3)));
        Round(f, g, h, a, b, c, d, e,
              0x240ca1ccul + (w3 += sigma1(w1) + w12 + sigma0(w4)));
        Round(e, f, g, h, a, b, c, d,
              0x2de92c6ful + (w4 += sigma1(w2) + w13 + sigma0(w5)));
        Round(d, e, f, g, h, a, b, c,
              0x4a7484aaul + (w5 += sigma1(w3) + w14 + sigma0(w6)));
        Round(c, d, e, f, g, h, a, b,
              0x5cb0a9dcul + (w6 += sigma1(w4) + w15 + sigma0(w7)));
        Round(b, c, d, e, f, g, h, a,
              0x76f988daul + (w7 += sigma1(w5) + w0 + sigma0(w8)));
        Round(a, b, c, d, e, f, g, h,
              0x983e5152ul + (w8 += sigma1(w6) + w1 + sigma0(w9)));
        Round(h, a, b, c, d, e, f, g,
              0xa831c66dul + (w9 += sigma1(w7) + w2 + sigma0(w10)));
        Round(g, h, a, b, c, d, e, f,
              0xb00327c8ul + (w10 += sigma1(w8) + w3 + sigma0(w11)));
        Round(f, g, h, a, b, c, d, e,
              0xbf597fc7ul + (w11 += sigma1(w9) + w4 + sigma0(w12)));
        Round(e, f, g, h, a, b, c, d,
              0xc6e00bf3ul + (w12 += sigma1(w10) + w5 + sigma0(w13)));
        Round(d, e, f, g, h, a, b, c,
              0xd5a79147ul + (w13 += sigma1(w11) + w6 + sigma0(w14)));
        Round(c, d, e, f, g, h, a, b,
              0x06ca6351ul + (w14 += sigma1(w12) + w7 + sigma0(w15)));
        Round(b, c, d, e, f, g, h, a,
              0x14292967ul + (w15 += sigma1(w13) + w8 + sigma0(w0)));
        Round(a, b, c, d, e, f, g, h,
              0x27b70a85ul + (w0 += sigma1(w14) + w9 + sigma0(w1)));
        Round(h, a, b, c, d, e, f, g,
              0x2e1b2138ul + (w1 += sigma1(w15) + w10 + sigma0(w2)));
        Round(g, h, a, b, c, d, e, f,
              0x4d2c6dfcul + (w2 += sigma1(w0) + w11 + sigma0(w3)));
        Round(f, g, h, a, b, c, d, e,
              0x53380d13ul + (w3 += sigma1(w1) + w12 + sigma0(w4)));
        Round(e, f, g, h, a, b, c, d,
              0x650a7354ul + (w4 += sigma1(w2) + w13 + sigma0(w5)));
        Round(d, e, f, g, h, a, b, c,
              0x766a0abbul + (w5 += sigma1(w3) + w14 + sigma0(w6)));
        Round(c, d, e, f, g, h, a, b,
              0x81c2c92eul + (w6 += sigma1(w4) + w15 + sigma0(w7)));
        Round(b, c, d, e, f, g, h, a,
              0x92722c85ul + (w7 += sigma1(w5) + w0 + sigma0(w8)));
        Round(a, b, c, d, e, f, g, h,
              0xa2bfe8a1ul + (w8 += sigma1(w6) + w1 + sigma0(w9)));
        Round(h, a, b, c, d, e, f, g,
              0xa81a664bul + (w9 += sigma1(w7) + w2 + sigma0(w10)));
        Round(g, h, a, b, c, d, e, f,
              0xc24b8b70ul + (w10 += sigma1(w8) + w3 + sigma0(w11)));
        Round(f, g, h, a, b, c, d, e,
              0xc76c51a3ul + (w11 += sigma1(w9) + w4 + sigma0(w12)));
        Round(e, f, g, h, a, b, c, d,
              0xd192e819ul + (w12 += sigma1(w10) + w5 + sigma0(w13)));
        Round(d, e, f, g, h, a, b, c,
              0xd6990624ul + (w13 += sigma1(w11) + w6 + sigma0(w14)));
        Round(c, d, e, f, g, h, a, b,
              0xf40e3585ul + (w14 += sigma1(w12) + w7 + sigma0(w15)));
        Round(b, c, d, e, f, g, h, a,
              0x106aa070ul + (w15 += sigma1(w13) + w8 + sigma0(w0)));
        Round(a, b, c, d, e, f, g, h,
              0x19a4c116ul + (w0 += sigma1(w14) + w9 + sigma0(w1)));
        Round(h, a, b, c, d, e, f, g,
              0x1e376c08ul + (w1 += sigma1(w15) + w10 + sigma0(w2)));
        Round(g, h, a, b, c, d, e, f,
              0x2748774cul + (w2 += sigma1(w0) + w11 + sigma0(w3)));
        Round(f, g, h, a, b, c, d, e,
              0x34b0bcb5ul + (w3 += sigma1(w1) + w12 + sigma0(w4)));
        Round(e, f, g, h, a, b, c, d,
              0x391c0cb3ul + (w4 += sigma1(w2) + w13 + sigma0(w5)));
        Round(d, e, f, g, h, a, b, c,
              0x4ed8aa4aul + (w5 += sigma1(w3) + w14 + sigma0(w6)));
        Round(c, d, e, f, g, h, a, b,
              0x5b9cca4ful + (w6 += sigma1(w4) + w15 + sigma0(w7)));
        Round(b, c, d, e, f, g, h, a,
              0x682e6ff3ul + (w7 += sigma1(w5) + w0 + sigma0(w8)));
        Round(a, b, c, d, e, f, g, h,
              0x748f82eeul + (w8 += sigma1(w6) + w1 + sigma0(w9)));
        Round(h, a, b, c, d, e, f, g,
              0x78a5636ful + (w9 += sigma1(w7) + w2 + sigma0(w10)));
        Round(g, h, a, b, c, d, e, f,
              0x84c87814ul + (w10 += sigma1(w8) + w3 + sigma0(w11)));
        Round(f, g, h, a, b, c, d, e,
              0x8cc70208ul + (w11 += sigma1(w9) + w4 + sigma0(w12)));
        Round(e, f, g, h, a, b, c, d,
              0x90befffaul + (w12 += sigma1(w10) + w5 + sigma0(w13)));
        Round(d, e, f, g, h, a, b, c,
              0xa4506cebul + (w13 += sigma1(w11) + w6 + sigma0(w14)));
        Round(c, d, e, f, g, h, a, b,
              0xbef9a3f7ul + (w14 + sigma1(w12) + w7 + sigma0(w15)));
        Round(b, c, d, e, f, g, h, a,
              0xc67178f2ul + (w15 + sigma1(w13) + w8 + sigma0(w0)));

        a += 0x6a09e667ul;
        b += 0xbb67ae85ul;
        c += 0x3c6ef372ul;
        d += 0xa54ff53aul;
        e += 0x510e527ful;
        f += 0x9b05688cul;
        g += 0x1f83d9abul;
        h += 0x5be0cd19ul;

        uint32_t t0 = a, t1 = b, t2 = c, t3 = d, t4 = e, t5 = f, t6 = g, t7 = h;

        // Transform 2
        Round(a, b, c, d, e, f, g, h, 0xc28a2f98ul);
        Round(h, a, b, c, d, e, f, g, 0x71374491ul);
        Round(g, h, a, b, c, d, e, f, 0xb5c0fbcful);
        Round(f, g, h, a, b, c, d, e, 0xe9b5dba5ul);
        Round(e, f, g, h, a, b, c, d, 0x3956c25bul);
        Round(d, e, f, g, h, a, b, c, 0x59f111f1ul);
        Round(c, d, e, f, g, h, a, b, 0x923f82a4ul);
        Round(b, c, d, e, f, g, h, a, 0xab1c5ed5ul);
        Round(a, b, c, d, e, f, g, h, 0xd807aa98ul);
        Round(h, a, b, c, d, e, f, g, 0x12835b01ul);
        Round(g, h, a, b, c, d, e, f, 0x243185beul);
        Round(f, g, h, a, b, c, d, e, 0x550c7dc3ul);
        Round(e, f, g, h, a, b, c, d, 0x72be5d74ul);
        Round(d, e, f, g, h, a, b, c, 0x80deb1feul);
        Round(c, d, e, f, g, h, a, b, 0x9bdc06a7ul);
        Round(b, c, d, e, f, g, h, a, 0xc19bf374ul);
        Round(a, b, c, d, e, f, g, h, 0x649b69c1ul);
        Round(h, a, b, c, d, e, f, g, 0xf0fe4786ul);
        Round(g, h, a, b, c, d, e, f, 0x0fe1edc6ul);
        Round(f, g, h, a, b, c, d, e, 0x240cf254ul);
        Round(e, f, g, h, a, b, c, d, 0x4fe9346ful);
        Round(d, e, f, g, h, a, b, c, 0x6cc984beul);
        Round(c, d, e, f, g, h, a, b, 0x61b9411eul);
        Round(b, c, d, e, f, g, h, a, 0x16f988faul);
        Round(a, b, c, d, e, f, g, h, 0xf2c65152ul);
        Round(h, a, b, c, d, e, f, g, 0xa88e5a6dul);
        Round(g, h, a, b, c, d, e, f, 0xb019fc65ul);
        Round(f, g, h, a, b, c, d, e, 0xb9d99ec7ul);
        Round(e, f, g, h, a, b, c, d, 0x9a1231c3ul);
        Round(d, e, f, g, h, a, b, c, 0xe70eeaa0ul);
        Round(c, d, e, f, g, h, a, b, 0xfdb1232bul);
        Round(b, c, d, e, f, g, h, a, 0xc7353eb0ul);
        Round(a, b, c, d, e, f, g, h, 0x3069bad5ul);
        Round(h, a, b, c, d, e, f, g, 0xcb976d5ful);
        Round(g, h, a, b, c, d, e, f, 0x5a0f118ful);
        Round(f, g, h, a, b, c, d, e, 0xdc1eeefdul);
        Round(e, f, g, h, a, b, c, d, 0x0a35b689ul);
        Round(d, e, f, g, h, a, b, c, 0xde0b7a04ul);
        Round(c, d, e, f, g, h, a, b, 0x58f4ca9dul);
        Round(b, c, d, e, f, g, h, a, 0xe15d5b16ul);
        Round(a, b, c, d, e, f, g, h, 0x007f3e86ul);
        Round(h, a, b, c, d, e, f, g, 0x37088980ul);
        Round(g, h, a, b, c, d, e, f, 0xa507ea32ul);
        Round(f, g, h, a, b, c, d, e, 0x6fab9537ul);
        Round(e, f, g, h, a, b, c, d, 0x17406110ul);
        Round(d, e, f, g, h, a, b, c, 0x0d8cd6f1ul);
        Round(c, d, e, f, g, h, a, b, 0xcdaa3b6dul);
        Round(b, c, d, e, f, g, h, a, 0xc0bbbe37ul);
        Round(a, b, c, d, e, f, g, h, 0x83613bdaul);
        Round(h, a, b, c, d, e, f, g, 0xdb48a363ul);
        Round(g, h, a, b, c, d, e, f, 0x0b02e931ul);
        Round(f, g, h, a, b, c, d, e, 0x6fd15ca7ul);
        Round(e, f, g, h, a, b, c, d, 0x521afacaul);
        Round(d, e, f, g, h, a, b, c, 0x31338431ul);
        Round(c, d, e, f, g, h, a, b, 0x6ed41a95ul);
        Round(b, c, d, e, f, g, h, a, 0x6d437890ul);
        Round(a, b, c, d, e, f, g, h, 0xc39c91f2ul);
        Round(h, a, b, c, d, e, f, g, 0x9eccabbdul);
        Round(g, h, a, b, c, d, e, f, 0xb5c9a0e6ul);
        Round(f, g, h, a, b, c, d, e, 0x532fb63cul);
        Round(e, f, g, h, a, b, c, d, 0xd2c741c6ul);
        Round(d, e, f, g, h, a, b, c, 0x07237ea3ul);
        Round(c, d, e, f, g, h, a, b, 0xa4954b68ul);
        Round(b, c, d, e, f, g, h, a, 0x4c191d76ul);

        w0 = t0 + a;
        w1 = t1 + b;
        w2 = t2 + c;
        w3 = t3 + d;
        w4 = t4 + e;
        w5 = t5 + f;
        w6 = t6 + g;
        w7 = t7 + h;

        // Transform 3
        a = 0x6a09e667ul;
        b = 0xbb67ae85ul;
        c = 0x3c6ef372ul;
        d = 0xa54ff53aul;
        e = 0x510e527ful;
        f = 0x9b05688cul;
        g = 0x1f83d9abul;
        h = 0x5be0cd19ul;

        Round(a, b, c, d, e, f, g, h, 0x428a2f98ul + w0);
        Round(h, a, b, c, d, e, f, g, 0x71374491ul + w1);
        Round(g, h, a, b, c, d, e, f, 0xb5c0fbcful + w2);
        Round(f, g, h, a, b, c, d, e, 0xe9b5dba5ul + w3);
        Round(e, f, g, h, a, b, c, d, 0x3956c25bul + w4);
        Round(d, e, f, g, h, a, b, c, 0x59f111f1ul + w5);
        Round(c, d, e, f, g, h, a, b, 0x923f82a4ul + w6);
        Round(b, c, d, e, f, g, h, a, 0xab1c5ed5ul + w7);
        Round(a, b, c, d, e, f, g, h, 0x5807aa98ul);
        Round(h, a, b, c, d, e, f, g, 0x12835b01ul);
        Round(g, h, a, b, c, d, e, f, 0x243185beul);
        Round(f, g, h, a, b, c, d, e, 0x550c7dc3ul);
        Round(e, f, g, h, a, b, c, d, 0x72be5d74ul);
        Round(d, e, f, g, h, a, b, c, 0x80deb1feul);
        Round(c, d, e, f, g, h, a, b, 0x9bdc06a7ul);
        Round(b, c, d, e, f, g, h, a, 0xc19bf274ul);
        Round(a, b, c, d, e, f, g, h, 0xe49b69c1ul + (w0 += sigma0(w1)));
        Round(h, a, b, c, d, e, f, g,
              0xefbe4786ul + (w1 += 0xa00000ul + sigma0(w2)));
        Round(g, h, a, b, c, d, e, f,
              0x0fc19dc6ul + (w2 += sigma1(w0) + sigma0(w3)));
        Round(f, g, h, a, b, c, d, e,
              0x240ca1ccul + (w3 += sigma1(w1) + sigma0(w4)));
        Round(e, f, g, h, a, b, c, d,
              0x2de92c6ful + (w4 += sigma1(w2) + sigma0(w5)));
        Round(d, e, f, g, h, a, b, c,
              0x4a7484aaul + (w5 += sigma1(w3) + sigma0(w6)));
        Round(c, d, e, f, g, h, a, b,
              0x5cb0a9dcul + (w6 += sigma1(w4) + 0x100ul + sigma0(w7)));
        Round(b, c, d, e, f, g, h, a,
              0x76f988daul + (w7 += sigma1(w5) + w0 + 0x11002000ul));
        Round(a, b, c, d, e, f, g, h,
              0x983e5152ul + (w8 = 0x80000000ul + sigma1(w6) + w1));
        Round(h, a, b, c, d, e, f, g, 0xa831c66dul + (w9 = sigma1(w7) + w2));
        Round(g, h, a, b, c, d, e, f, 0xb00327c8ul + (w10 = sigma1(w8) + w3));
        Round(f, g, h, a, b, c, d, e, 0xbf597fc7ul + (w11 = sigma1(w9) + w4));
        Round(e, f, g, h, a, b, c, d, 0xc6e00bf3ul + (w12 = sigma1(w10) + w5));
        Round(d, e, f, g, h, a, b, c, 0xd5a79147ul + (w13 = sigma1(w11) + w6));
        Round(c, d, e, f, g, h, a, b,
              0x06ca6351ul + (w14 = sigma1(w12) + w7 + 0x400022ul));
        Round(b, c, d, e, f, g, h, a,
              0x14292967ul + (w15 = 0x100ul + sigma1(w13) + w8 + sigma0(w0)));
        Round(a, b, c, d, e, f, g, h,
              0x27b70a85ul + (w0 += sigma1(w14) + w9 + sigma0(w1)));
        Round(h, a, b, c, d, e, f, g,
              0x2e1b2138ul + (w1 += sigma1(w15) + w10 + sigma0(w2)));
        Round(g, h, a, b, c, d, e, f,
              0x4d2c6dfcul + (w2 += sigma1(w0) + w11 + sigma0(w3)));
        Round(f, g, h, a, b, c, d, e,
              0x53380d13ul + (w3 += sigma1(w1) + w12 + sigma0(w4)));
        Round(e, f, g, h, a, b, c, d,
              0x650a7354ul + (w4 += sigma1(w2) + w13 + sigma0(w5)));
        Round(d, e, f, g, h, a, b, c,
              0x766a0abbul + (w5 += sigma1(w3) + w14 + sigma0(w6)));
        Round(c, d, e, f, g, h, a, b,
              0x81c2c92eul + (w6 += sigma1(w4) + w15 + sigma0(w7)));
        Round(b, c, d, e, f, g, h, a,
              0x92722c85ul + (w7 += sigma1(w5) + w0 + sigma0(w8)));
        Round(a, b, c, d, e, f, g, h,
              0xa2bfe8a1ul + (w8 += sigma1(w6) + w1 + sigma0(w9)));
        Round(h, a, b, c, d, e, f, g,
              0xa81a664bul + (w9 += sigma1(w7) + w2 + sigma0(w10)));
        Round(g, h, a, b, c, d, e, f,
              0xc24b8b70ul + (w10 += sigma1(w8) + w3 + sigma0(w11)));
        Round(f, g, h, a, b, c, d, e,
              0xc76c51a3ul + (w11 += sigma1(w9) + w4 + sigma0(w12)));
        Round(e, f, g, h, a, b, c, d,
              0xd192e819ul + (w12 += sigma1(w10) + w5 + sigma0(w13)));
        Round(d, e, f, g, h, a, b, c,
              0xd6990624ul + (w13 += sigma1(w11) + w6 + sigma0(w14)));
        Round(c, d, e, f, g, h, a, b,
              0xf40e3585ul + (w14 += sigma1(w12) + w7 + sigma0(w15)));
        Round(b, c, d, e, f, g, h, a,
              0x106aa070ul + (w15 += sigma1(w13) + w8 + sigma0(w0)));
        Round(a, b, c, d, e, f, g, h,
              0x19a4c116ul + (w0 += sigma1(w14) + w9 + sigma0(w1)));
        Round(h, a, b, c, d, e, f, g,
              0x1e376c08ul + (w1 += sigma1(w15) + w10 + sigma0(w2)));
        Round(g, h, a, b, c, d, e, f,
              0x2748774cul + (w2 += sigma1(w0) + w11 + sigma0(w3)));
        Round(f, g, h, a, b, c, d, e,
              0x34b0bcb5ul + (w3 += sigma1(w1) + w12 + sigma0(w4)));
        Round(e, f, g, h, a, b, c, d,
              0x391c0cb3ul + (w4 += sigma1(w2) + w13 + sigma0(w5)));
        Round(d, e, f, g, h, a, b, c,
              0x4ed8aa4aul + (w5 += sigma1(w3) + w14 + sigma0(w6)));
        Round(c, d, e, f, g, h, a, b,
              0x5b9cca4ful + (w6 += sigma1(w4) + w15 + sigma0(w7)));
        Round(b, c, d, e, f, g, h, a,
              0x682e6ff3ul + (w7 += sigma1(w5) + w0 + sigma0(w8)));
        Round(a, b, c, d, e, f, g, h,
              0x748f82eeul + (w8 += sigma1(w6) + w1 + sigma0(w9)));
        Round(h, a, b, c, d, e, f, g,
              0x78a5636ful + (w9 += sigma1(w7) + w2 + sigma0(w10)));
        Round(g, h, a, b, c, d, e, f,
              0x84c87814ul + (w10 += sigma1(w8) + w3 + sigma0(w11)));
        Round(f, g, h, a, b, c, d, e,
              0x8cc70208ul + (w11 += sigma1(w9) + w4 + sigma0(w12)));
        Round(e, f, g, h, a, b, c, d,
              0x90befffaul + (w12 += sigma1(w10) + w5 + sigma0(w13)));
        Round(d, e, f, g, h, a, b, c,
              0xa4506cebul + (w13 += sigma1(w11) + w6 + sigma0(w14)));
        Round(c, d, e, f, g, h, a, b,
              0xbef9a3f7ul + (w14 + sigma1(w12) + w7 + sigma0(w15)));
        Round(b, c, d, e, f, g, h, a,
              0xc67178f2ul + (w15 + sigma1(w13) + w8 + sigma0(w0)));

        // Output
        WriteBE32(out + 0, a + 0x6a09e667ul);
        WriteBE32(out + 4, b + 0xbb67ae85ul);
        WriteBE32(out + 8, c + 0x3c6ef372ul);
        WriteBE32(out + 12, d + 0xa54ff53aul);
        WriteBE32(out + 16, e + 0x510e527ful);
        WriteBE32(out + 20, f + 0x9b05688cul);
        WriteBE32(out + 24, g + 0x1f83d9abul);
        WriteBE32(out + 28, h + 0x5be0cd19ul);
    }

} // namespace sha256

typedef void (*TransformType)(uint32_t *, const uint8_t *, size_t);
typedef void (*TransformD64Type)(uint8_t *, const uint8_t *);

template <TransformType tr>
void TransformD64Wrapper(uint8_t *out, const uint8_t *in) {
    uint32_t s[8];
    static const uint8_t padding1[64] = {
        0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0,    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0,    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0};
    uint8_t buffer2[64] = {0,    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                           0,    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                           0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                           0,    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0};
    sha256::Initialize(s);
    tr(s, in, 1);
    tr(s, padding1, 1);
    WriteBE32(buffer2 + 0, s[0]);
    WriteBE32(buffer2 + 4, s[1]);
    WriteBE32(buffer2 + 8, s[2]);
    WriteBE32(buffer2 + 12, s[3]);
    WriteBE32(buffer2 + 16, s[4]);
    WriteBE32(buffer2 + 20, s[5]);
    WriteBE32(buffer2 + 24, s[6]);
    WriteBE32(buffer2 + 28, s[7]);
    sha256::Initialize(s);
    tr(s, buffer2, 1);
    WriteBE32(out + 0, s[0]);
    WriteBE32(out + 4, s[1]);
    WriteBE32(out + 8, s[2]);
    WriteBE32(out + 12, s[3]);
    WriteBE32(out + 16, s[4]);
    WriteBE32(out + 20, s[5]);
    WriteBE32(out + 24, s[6]);
    WriteBE32(out + 28, s[7]);
}

TransformType Transform = sha256::Transform;
TransformD64Type TransformD64 = sha256::TransformD64;
TransformD64Type TransformD64_2way = nullptr;
TransformD64Type TransformD64_4way = nullptr;
TransformD64Type TransformD64_8way = nullptr;

bool SelfTest() {
    // Input state (equal to the initial SHA256 state)
    static const uint32_t init[8] = {0x6a09e667ul, 0xbb67ae85ul, 0x3c6ef372ul,
                                     0xa54ff53aul, 0x510e527ful, 0x9b05688cul,
                                     0x1f83d9abul, 0x5be0cd19ul};
    // Some random input data to test with
    static const uint8_t data[641] =
        "-" // Intentionally not aligned
        "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do "
        "eiusmod tempor incididunt ut labore et dolore magna aliqua. Et m"
        "olestie ac feugiat sed lectus vestibulum mattis ullamcorper. Mor"
        "bi blandit cursus risus at ultrices mi tempus imperdiet nulla. N"
        "unc congue nisi vita suscipit tellus mauris. Imperdiet proin fer"
        "mentum leo vel orci. Massa tempor nec feugiat nisl pretium fusce"
        " id velit. Telus in metus vulputate eu scelerisque felis. Mi tem"
        "pus imperdiet nulla malesuada pellentesque. Tristique magna sit.";
    // Expected output state for hashing the i*64 first input bytes above
    // (excluding SHA256 padding).
    static const uint32_t result[9][8] = {
        {0x6a09e667ul, 0xbb67ae85ul, 0x3c6ef372ul, 0xa54ff53aul, 0x510e527ful,
         0x9b05688cul, 0x1f83d9abul, 0x5be0cd19ul},
        {0x91f8ec6bul, 0x4da10fe3ul, 0x1c9c292cul, 0x45e18185ul, 0x435cc111ul,
         0x3ca26f09ul, 0xeb954caeul, 0x402a7069ul},
        {0xcabea5acul, 0x374fb97cul, 0x182ad996ul, 0x7bd69cbful, 0x450ff900ul,
         0xc1d2be8aul, 0x6a41d505ul, 0xe6212dc3ul},
        {0xbcff09d6ul, 0x3e76f36eul, 0x3ecb2501ul, 0x78866e97ul, 0xe1c1e2fdul,
         0x32f4eafful, 0x8aa6c4e5ul, 0xdfc024bcul},
        {0xa08c5d94ul, 0x0a862f93ul, 0x6b7f2f40ul, 0x8f9fae76ul, 0x6d40439ful,
         0x79dcee0cul, 0x3e39ff3aul, 0xdc3bdbb1ul},
        {0x216a0895ul, 0x9f1a3662ul, 0xe99946f9ul, 0x87ba4364ul, 0x0fb5db2cul,
         0x12bed3d3ul, 0x6689c0c7ul, 0x292f1b04ul},
        {0xca3067f8ul, 0xbc8c2656ul, 0x37cb7e0dul, 0x9b6b8b0ful, 0x46dc380bul,
         0xf1287f57ul, 0xc42e4b23ul, 0x3fefe94dul},
        {0x3e4c4039ul, 0xbb6fca8cul, 0x6f27d2f7ul, 0x301e44a4ul, 0x8352ba14ul,
         0x5769ce37ul, 0x48a1155ful, 0xc0e1c4c6ul},
        {0xfe2fa9ddul, 0x69d0862bul, 0x1ae0db23ul, 0x471f9244ul, 0xf55c0145ul,
         0xc30f9c3bul, 0x40a84ea0ul, 0x5b8a266cul},
    };
    // Expected output for each of the individual 8 64-byte messages under full
    // double SHA256 (including padding).
    static const uint8_t result_d64[256] = {
        0x09, 0x3a, 0xc4, 0xd0, 0x0f, 0xf7, 0x57, 0xe1, 0x72, 0x85, 0x79, 0x42,
        0xfe, 0xe7, 0xe0, 0xa0, 0xfc, 0x52, 0xd7, 0xdb, 0x07, 0x63, 0x45, 0xfb,
        0x53, 0x14, 0x7d, 0x17, 0x22, 0x86, 0xf0, 0x52, 0x48, 0xb6, 0x11, 0x9e,
        0x6e, 0x48, 0x81, 0x6d, 0xcc, 0x57, 0x1f, 0xb2, 0x97, 0xa8, 0xd5, 0x25,
        0x9b, 0x82, 0xaa, 0x89, 0xe2, 0xfd, 0x2d, 0x56, 0xe8, 0x28, 0x83, 0x0b,
        0xe2, 0xfa, 0x53, 0xb7, 0xd6, 0x6b, 0x07, 0x85, 0x83, 0xb0, 0x10, 0xa2,
        0xf5, 0x51, 0x3c, 0xf9, 0x60, 0x03, 0xab, 0x45, 0x6c, 0x15, 0x6e, 0xef,
        0xb5, 0xac, 0x3e, 0x6c, 0xdf, 0xb4, 0x92, 0x22, 0x2d, 0xce, 0xbf, 0x3e,
        0xe9, 0xe5, 0xf6, 0x29, 0x0e, 0x01, 0x4f, 0xd2, 0xd4, 0x45, 0x65, 0xb3,
        0xbb, 0xf2, 0x4c, 0x16, 0x37, 0x50, 0x3c, 0x6e, 0x49, 0x8c, 0x5a, 0x89,
        0x2b, 0x1b, 0xab, 0xc4, 0x37, 0xd1, 0x46, 0xe9, 0x3d, 0x0e, 0x85, 0xa2,
        0x50, 0x73, 0xa1, 0x5e, 0x54, 0x37, 0xd7, 0x94, 0x17, 0x56, 0xc2, 0xd8,
        0xe5, 0x9f, 0xed, 0x4e, 0xae, 0x15, 0x42, 0x06, 0x0d, 0x74, 0x74, 0x5e,
        0x24, 0x30, 0xce, 0xd1, 0x9e, 0x50, 0xa3, 0x9a, 0xb8, 0xf0, 0x4a, 0x57,
        0x69, 0x78, 0x67, 0x12, 0x84, 0x58, 0xbe, 0xc7, 0x36, 0xaa, 0xee, 0x7c,
        0x64, 0xa3, 0x76, 0xec, 0xff, 0x55, 0x41, 0x00, 0x2a, 0x44, 0x68, 0x4d,
        0xb6, 0x53, 0x9e, 0x1c, 0x95, 0xb7, 0xca, 0xdc, 0x7f, 0x7d, 0x74, 0x27,
        0x5c, 0x8e, 0xa6, 0x84, 0xb5, 0xac, 0x87, 0xa9, 0xf3, 0xff, 0x75, 0xf2,
        0x34, 0xcd, 0x1a, 0x3b, 0x82, 0x2c, 0x2b, 0x4e, 0x6a, 0x46, 0x30, 0xa6,
        0x89, 0x86, 0x23, 0xac, 0xf8, 0xa5, 0x15, 0xe9, 0x0a, 0xaa, 0x1e, 0x9a,
        0xd7, 0x93, 0x6b, 0x28, 0xe4, 0x3b, 0xfd, 0x59, 0xc6, 0xed, 0x7c, 0x5f,
        0xa5, 0x41, 0xcb, 0x51};

    // Test Transform() for 0 through 8 transformations.
    for (size_t i = 0; i <= 8; ++i) {
        uint32_t state[8];
        std::copy(init, init + 8, state);
        Transform(state, data + 1, i);
        if (!std::equal(state, state + 8, result[i])) {
            return false;
        }
    }

    // Test TransformD64
    {
        uint8_t out[32];
        TransformD64(out, data + 1);
        if (!std::equal(out, out + 32, result_d64)) {
            return false;
        }
    }

    // Test TransformD64_2way, if available.
    if (TransformD64_2way) {
        uint8_t out[64];
        TransformD64_2way(out, data + 1);
        if (!std::equal(out, out + 64, result_d64)) {
            return false;
        }
    }

    // Test TransformD64_4way, if available.
    if (TransformD64_4way) {
        uint8_t out[128];
        TransformD64_4way(out, data + 1);
        if (!std::equal(out, out + 128, result_d64)) {
            return false;
        }
    }

    // Test TransformD64_8way, if available.
    if (TransformD64_8way) {
        uint8_t out[256];
        TransformD64_8way(out, data + 1);
        if (!std::equal(out, out + 256, result_d64)) {
            return false;
        }
    }

    return true;
}

#if defined(USE_ASM) &&                                                        \
    (defined(__x86_64__) || defined(__amd64__) || defined(__i386__))
/** Check whether the OS has enabled AVX registers. */
bool AVXEnabled() {
    uint32_t a, d;
    __asm__("xgetbv" : "=a"(a), "=d"(d) : "c"(0));
    return (a & 6) == 6;
}
#endif
} // namespace

std::string SHA256AutoDetect() {
    std::string ret = "standard";
#if defined(USE_ASM) && defined(HAVE_GETCPUID)
    bool have_sse4 = false;
    bool have_xsave = false;
    bool have_avx = false;
    bool have_avx2 = false;
    bool have_shani = false;
    bool enabled_avx = false;

    (void)AVXEnabled;
    (void)have_sse4;
    (void)have_avx;
    (void)have_xsave;
    (void)have_avx2;
    (void)have_shani;
    (void)enabled_avx;

    uint32_t eax, ebx, ecx, edx;
    GetCPUID(1, 0, eax, ebx, ecx, edx);
    have_sse4 = (ecx >> 19) & 1;
    have_xsave = (ecx >> 27) & 1;
    have_avx = (ecx >> 28) & 1;
    if (have_xsave && have_avx) {
        enabled_avx = AVXEnabled();
    }
    if (have_sse4) {
        GetCPUID(7, 0, eax, ebx, ecx, edx);
        have_avx2 = (ebx >> 5) & 1;
        have_shani = (ebx >> 29) & 1;
    }

#if defined(ENABLE_SHANI) && !defined(BUILD_BITCOIN_INTERNAL)
    if (have_shani) {
        Transform = sha256_shani::Transform;
        TransformD64 = TransformD64Wrapper<sha256_shani::Transform>;
        TransformD64_2way = sha256d64_shani::Transform_2way;
        ret = "shani(1way,2way)";
        have_sse4 = false; // Disable SSE4/AVX2;
        have_avx2 = false;
    }
#endif

    if (have_sse4) {
#if defined(__x86_64__) || defined(__amd64__)
        Transform = sha256_sse4::Transform;
        TransformD64 = TransformD64Wrapper<sha256_sse4::Transform>;
        ret = "sse4(1way)";
#endif
#if defined(ENABLE_SSE41) && !defined(BUILD_BITCOIN_INTERNAL)
        TransformD64_4way = sha256d64_sse41::Transform_4way;
        ret += ",sse41(4way)";
#endif
    }

#if defined(ENABLE_AVX2) && !defined(BUILD_BITCOIN_INTERNAL)
    if (have_avx2 && have_avx && enabled_avx) {
        TransformD64_8way = sha256d64_avx2::Transform_8way;
        ret += ",avx2(8way)";
    }
#endif
#endif

    assert(SelfTest());
    return ret;
}

////// SHA-256

CSHA256::CSHA256() : bytes(0) {
    sha256::Initialize(s);
}

CSHA256 &CSHA256::Write(const uint8_t *data, size_t len) {
    const uint8_t *end = data + len;
    size_t bufsize = bytes % 64;
    if (bufsize && bufsize + len >= 64) {
        // Fill the buffer, and process it.
        memcpy(buf + bufsize, data, 64 - bufsize);
        bytes += 64 - bufsize;
        data += 64 - bufsize;
        Transform(s, buf, 1);
        bufsize = 0;
    }
    if (end - data >= 64) {
        size_t blocks = (end - data) / 64;
        Transform(s, data, blocks);
        data += 64 * blocks;
        bytes += 64 * blocks;
    }
    if (end > data) {
        // Fill the buffer with what remains.
        memcpy(buf + bufsize, data, end - data);
        bytes += end - data;
    }
    return *this;
}

void CSHA256::Finalize(uint8_t hash[OUTPUT_SIZE]) {
    static const uint8_t pad[64] = {0x80};
    uint8_t sizedesc[8];
    WriteBE64(sizedesc, bytes << 3);
    Write(pad, 1 + ((119 - (bytes % 64)) % 64));
    Write(sizedesc, 8);
    WriteBE32(hash, s[0]);
    WriteBE32(hash + 4, s[1]);
    WriteBE32(hash + 8, s[2]);
    WriteBE32(hash + 12, s[3]);
    WriteBE32(hash + 16, s[4]);
    WriteBE32(hash + 20, s[5]);
    WriteBE32(hash + 24, s[6]);
    WriteBE32(hash + 28, s[7]);
}

CSHA256 &CSHA256::Reset() {
    bytes = 0;
    sha256::Initialize(s);
    return *this;
}

void SHA256D64(uint8_t *out, const uint8_t *in, size_t blocks) {
    if (TransformD64_8way) {
        while (blocks >= 8) {
            TransformD64_8way(out, in);
            out += 256;
            in += 512;
            blocks -= 8;
        }
    }
    if (TransformD64_4way) {
        while (blocks >= 4) {
            TransformD64_4way(out, in);
            out += 128;
            in += 256;
            blocks -= 4;
        }
    }
    if (TransformD64_2way) {
        while (blocks >= 2) {
            TransformD64_2way(out, in);
            out += 64;
            in += 128;
            blocks -= 2;
        }
    }
    while (blocks) {
        TransformD64(out, in);
        out += 32;
        in += 64;
        --blocks;
    }
}
